It is strongly recommended. Incorporating overhead speakers in your Dolby Atmos mix room will allow you to take advantage of the vertical dimension in your mix. The most common speaker configuration for music-focused Atmos mix rooms is 7.1.4, but this is by no means the only configuration that may be employed to create immersive Atmos mixes. Keep in mind that it is also possible to mix and monitor Atmos binaurally using headphones.